_Form.cshtml

@model FormViewModel

@if (Model.Show)
{
    System.Web.Mvc.Ajax.AjaxOptions options = new AjaxOptions();
    options.HttpMethod = "POST";
    options.InsertionMode = InsertionMode.ReplaceWith;
    options.UpdateTargetId = String.Format("form-{0}", Model.Form.Id);
    options.Url = Model.ActionUrl;
    
    <div id="@options.UpdateTargetId" >

        @Html.ValidationSummary(false)

        @using(Ajax.BeginXForm(Model.Form, options))
        {

            @Html.AntiForgeryToken()
            Html.RenderXForm(Model.Form);
            
        }

    </div>
}